Acoustic measurements of models of military style supersonic nozzle jets

Kuo, Ching-Wen; Veltin, Jérémy; McLaughlin, Dennis K.

doi:10.1016/j.cja.2013.12.006

Cited by 18 publications

(20 citation statements)

References 9 publications

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“…shows a distinct sharp frequency peak other than that associated with the BSAN "hump" from =50 onwards. Furthermore, the frequency of the sharp peak remains invariant at approximately St=0.25, which is consistent with a value of approximately St=0.24 in [28]. It is also always lower than that associated with the BSAN, regardless of the polar angle.…”

Section: Acousticssupporting

confidence: 83%

“…Microphone signals were acquired by a National Instruments PXI-6143 data acquisition board installed in a National Instruments PXIe-1082 chassis at a sampling rate of 200 kHz with 3 s sampling time per measurement. A MATLAB ® code based on the approach described by Kuo et al [28] was used for data post-processing. Firstly, the raw data was converted from voltage values to pressure values through the microphone calibration constant.…”

Section: Far-field Acoustic Measurementsmentioning

confidence: 99%

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Mitigation of under-expanded supersonic jet noise through stepped nozzles

Wei

Mariani

Chua

et al. 2019

Journal of Sound and Vibration

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Section: Acousticssupporting

confidence: 83%

Section: Far-field Acoustic Measurementsmentioning

confidence: 99%

Mitigation of under-expanded supersonic jet noise through stepped nozzles

Wei

Mariani

Chua

et al. 2019

Journal of Sound and Vibration

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“…In order to simulate the flow and acoustic properties of a hot jet, Doty and McLaughlin [30] and Papamoschou [31] have shown the detailed methodology of heated jet simulation via a mixture of helium and air. Recent careful comparisons [32] with measurements performed in other facilities have shown very good agreement when matching the acoustic velocity of the mixture jet to that of a heated jet following a procedure developed by Doty and McLaughlin [30]. downstream direction of the plenum collects the jet exhaust and prevents possible uncontrolled helium accumulation in the anechoic chamber.…”

Section: Experimental Facilities Set-up and Procedures 21 Facilitymentioning

confidence: 92%

Effects of Jet Noise Source Distribution on Acoustic Far-Field Measurements

Kuo

Veltin

McLaughlin

2012

International Journal of Aeroacoustics

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Jet noise production is well known to be of a distributed nature along the jet, with high frequency noise components radiating from locations close to the nozzle exit and low frequency noise being produced farther downstream, around the end of the potential core. Such a distributed source implies that measurements need to be made at a significant distance from the source in order to be in the true geometric (acoustic) far field. The current study presents measurements of fully expanded M j = 1.5 jets operating with cold air and heat simulated at TTR = 2.2 made at various positions in the acoustic field, some short of the minimum distance required to be in the true geometric far field. A close look is taken at the details of the noise generation region in order to better understand the mismatch between spectra measured at various acoustic field radial locations. A processing method is presented to correct for near-field effects and efficiently compare near and far field spectra with unprecedented accuracy. This technique is then further used to clarify the nonlinear propagation effects that can be observed at the high frequency end of high speed jets noise.

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“…Typical variable area nozzles found on modern high-performance military aircraft are representative of this situation. A renewed interest in studying the related jet noise has been prompted by the US Navy to specifically address the noise-induced hearing loss and degraded operational awareness resulting from the ever increasing noise levels of higher thrust engines [1,2].…”

Section: Introductionmentioning

confidence: 99%

A Laboratory Framework for Synchronous Near/Far-Field Acoustics and MHz PIV in High-Temperature, Shock-Containing, Jets

Murray

Lyons

Tinney

et al. 2012

ASME 2012 Noise Control and Acoustics Division Conference

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This paper describes the experimental study of the noise generating characteristics of high-temperature, shock-containing jets emanating from conic-section, converging-diverging (C-D) nozzles. Conic C-D nozzles consist of two conic sections, one contracting and the other expanding, joined to form a supersonic nozzle with a very sharp radius of curvature at the nozzle throat. An experiment is conducted in which temporally resolved flow-field measurements are acquired simultaneously with near-field and far-field acoustics to allow investigation of the turbulence associated with noise generation. The MHz rate PIV system and its synchronization with acoustic measurements is described along with methods for data analysis. General acoustic results are presented to characterize the spectral content present, and preliminary results on the measured turbulence structures are discussed.

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Acoustic measurements of models of military style supersonic nozzle jets

Cited by 18 publications

References 9 publications

Mitigation of under-expanded supersonic jet noise through stepped nozzles

Mitigation of under-expanded supersonic jet noise through stepped nozzles

Effects of Jet Noise Source Distribution on Acoustic Far-Field Measurements

A Laboratory Framework for Synchronous Near/Far-Field Acoustics and MHz PIV in High-Temperature, Shock-Containing, Jets

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